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Threat Encyclopedia

WORM_PIZZER.SM

ANALYSIS BY

Rhena Inocencio


ALIASES:

Trojan.MSIL.Crypt.aagf (Kaspersky)

PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

OVERALL RISK RATING:
DAMAGE POTENTIAL:
DISTRIBUTION POTENTIAL:
REPORTED INFECTION:

  • Threat Type:Worm

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

Infection Channel:

Copies itself in archived files


This malware propagates by creating copies of itself in password-protected archives. It also downloads other malware onto the systems it infects, causing malicious routines to be exhibited.

To get a one-glance comprehensive view of the behavior of this Worm, refer to the Threat Diagram shown below.

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

TECHNICAL DETAILS

File Size:

174,592 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

24 May 2013

Payload:

Downloads files

Arrival Details

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

This worm accesses the following websites to download files:

  • http://tazbox.{BLOCKED}o.org/downloader/kl/AppLauncher.exe
  • http://tazbox.{BLOCKED}o.org/downloader/miner/dwm.exe

It saves the files it downloads using the following names:

  • %Application Data%\Microsoft\Internet Explorer\AppLauncher.exe
  • %Application Data%\Microsoft\windows\dwm.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This worm opens the following applications:

  • Winrar.exe

NOTES:
This worm drops copies of itself in archives (.ZIP, .RAR, and .RAR SFX) in %System Root% and subfolders as follows:

  • {malware folder}\{malware filename}
It uses the following command line in Winrar.EXE to drop its copies:
  • a {archive path} {malware path}

SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.938.02

FIRST VSAPI PATTERN DATE:

24 May 2013

VSAPI OPR PATTERN File:

9.939.00

VSAPI OPR PATTERN Date:

25 May 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %Application Data%\Microsoft\Internet Explorer\AppLauncher.exe
  • %Application Data%\Microsoft\windows\dwm.exe

Step 3

Scan your computer with your Trend Micro product to delete files detected as WORM_PIZZER.SM . If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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